GSW has selected the Noritz line of tankless water heaters to complement our portfolio of high performance residential and commercial gas water heating solutions. Noritz tankless water heaters have been proven worldwide and are the most technologically advanced, highest-rated tankless heaters. The N-084M-DV is the only commercial direct vent on the market. All Noritz commercial, direct vent and most residential models are Quick-Connect compatible, allowing two units to be installed in series, doubling water capacity when needed. For heavy industrial applications, up to 24 commercial heaters can be linked up with a system controller to provide endless hot water.